Once the installation is successful, you can re-enable your security software. 4. Fix Windows Management Instrumentation (WMI)
. If you see "Kerio Virtual Network Adapter" with a warning icon (or any grayed-out version), right-click and select Uninstall device
: Run the following commands in an Administrator Command Prompt: netsh winsock reset netsh int ip reset Installer Preparation Download the latest client from the Kerio Software Archive Right-click the Properties , and check the Run the installer as an Administrator with local antivirus temporarily disabled. Advanced Workarounds error 28201 kerio vpn client
Whether you are an existing setup or doing a first-time installation .
This error typically manifests during the installation, upgrade, or initialization of the Kerio VPN Client, completely blocking the user from establishing a secure tunnel. Once the installation is successful, you can re-enable
If you are a system administrator or a remote worker seeing the message "VPN Client error: 28201" or "Connection failed (Error 28201)" , you know the panic of being locked out of the corporate network.
Error 28201 is fundamentally a driver installation failure. When you install the Kerio VPN Client, the software attempts to provision a virtual network adapter (the Kerio Virtual Network Adapter) into your Windows operating system. If you see "Kerio Virtual Network Adapter" with
Create an exception for kerio-vpn-client.exe and UDP/TCP ports 443, 500, and 4500 (or your custom VPN port).
How to Fix Kerio VPN Client Error 28201: A Step-by-Step Troubleshooting Guide
To prevent this issue in the future, always fully uninstall old client versions using a dedicated uninstaller tool before moving to a new version of Kerio Control. If youg., Windows 11, Windows 10) are you running?